By Jennifer Davis
Updated Oct 28, 2012 @ 9:00 am
Samuel Goldwyn/ Courtesy: Everett Collection; Universal/Courtesy Everett Collection; Universal/courtesy Everett Collection

Happy Birthday, Julia Roberts! America’s Sweetheart turns 45 today. With her megawatt smile and ageless skin, the actress is still an extremely Pretty Woman. To celebrate her the big day, take a walk down memory lane with the star's best style moments—from her sweet and southern style in Steel Magnolias to her knockout gown at this year's Oscars. Click through the gallery to see all of her amazing looks.